Akademik Veri Yönetim Sistemi
JOURNAL OF PROSTHETIC DENTISTRY, cilt.133, sa.5, 2025 (SCI-Expanded)
Statement of problem. Although the post-polymerization is a necessary step to attain the final properties and color of the 3-dimensionally (3D) printed composite resins, research on its effects on color change and surface roughness is lacking. Purpose. The purpose of this in vitro study was to evaluate the effect of post-polymerization time and additional placement in boiling water on the color change and surface roughness of 3D printed composite resins after exposure to coffee for 30 days. Material and methods. Sixty disk-shaped specimens (& Oslash;10x2 mm) were 3D printed with composite resin (Crowntec). The specimens were randomly divided into 6 groups (n=10), according to the post-polymerization process at 3 different times (2x5, 2x10, and 2x20 minutes) and depending on subsequent placement in boiling water. The color differences (Delta E-00) between the baseline and each aging period (1, 7, 15, and 30 days) were determined by using a spectrophotometer. After 30-day aging period, Delta L*, Delta a*, and Delta b* values were calculated. The surface roughness (Ra) was measured at various aging periods (initial, 7, 15, and 30 days) by a 3D noncontact optical profilometer. The data were analyzed using 2-way repeated measures ANOVA and 1-way ANOVA tests for each aging period followed by Tukey tests (alpha=.05). Results. As the post-polymerization time increased, a significant decrease was found in Delta E(00 )values (P<.001), while no significant difference was found in Ra values (P=.554). The values of Delta E(00 )and Ra increased with the aging period (P<.001). Additional placement in boiling water resulted in a statistically significant decrease in both Delta E(00 )and Ra values (P<.001). As the post-polymerization time increased, the Delta a* and Delta b* values decreased, while the negative Delta L*values increased (P<.001), except for Delta a* between 2x10 and 2x20 (P=.175). Additional placement in boiling water resulted in a significant decrease in Delta a* and Delta b* values and an increase in the negative Delta L*values (P<.001), except for Delta a* in 2x20 (P=.379). Conclusions. An increase in post-polymerization time resulted in reduced stainability, while additional placement in boiling water led to reduced stainability and roughness. When subsequently placed in boiling water, the post-polymerization time had no effect on either stainability or roughness.